{
  "manageEntity": {
    "action": "Save",
    "entityId": "745051551",
    "entityType": "Track",
    "nonce": "0x2661a476345b1329e6c5b23d2e41258ec81107201aa49849e0da16147f8ad3c7",
    "signature": "0x0aec6a68becf9f71ca9abe536706b3eec79e81c073e6c6880faa6a0881eb4d4039c0037deeda5647e5d73d391e7f6e407a3607439f1a80931217284d4e547c0a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}